Siemens SIMATIC S5 Manual page 218

SFEH: Q, BI
KANR: Q, BY
FMLD: Q, W
IP244
C79000–B8576–C861–02
For this reason, parameter BFEH is set although the module is
operating correctly. The evaluation of this signal no longer serves
a purpose.
The processing of function block FB 162 is not interrupted by the
signal BFEH.
The parameter BFEH is reset if the power supply to the
programmable controller is switched off or if the commands KS
(cold restart) or PA (assign parameters) are sent. Note that the
command KS must only be used in the organization blocks OB 20,
OB 21 and OB 22.
Group error
If an error occurs on one of the controller and measurement
channels of the module, the parameter SFEH is set. The
parameters KANR and FMLD provide more information about the
error.
Once all the errors have been dealt with, the parameter SFEH is
reset automatically.
Channel number
The channel number specifies which controller or which channel
has signalled an error (0
Error signal byte
If the IP 244 signals a group error, the parameter KANR contains
the number of the channel on which the error has occurred. The
parameter FMLD contains information about the cause of the
problem. If several channels have problems at the same time, the
parameter FMLD contains the error bytes of the channel with the
lowest number.
Exception:
if an error occurs on channel 15 (KANR = 15) the parameter
FMLD has the value zero (corresponds to: problem with Pt100 on
channel 15).
The function block automatically resets the parameter SFEH and
clears the error bytes when there are no further errors.
KANR 15).
Function
5–13